The mortality rate of newborns having black mothers was more than twice as high as that of white or Asian mothers. No, it's not about social factors - categories were created to eliminate them. In fact, negroid women fared worst in every category (fattest, worst medical care, smoked most often, etc.), but comparing them to women of other races, in the same categories of obesity, medical care, smoking, etc. further their children had twice the mortality rate of white women or Asian women. Between white and Asian women, the difference was negligible and their children had the lowest mortality rate.